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发布时间:2020-01-06 00:00:00
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水泥混凝土制品

钢筋混凝土顶管施工端面裂缝模拟分析
钢筋混凝土顶管施工端面裂缝模拟分析
  • 袁焕鑫1,蒋强忠2,杜新喜2,张 帆2,李昌正2
2022年第11期
摘要
引用本文
摘   要:为分析钢筋混凝土顶管施工过程中端面开裂情况,考虑材料的几何非线性和混凝土的损伤退化,建立了ABAQUS有限元数值模型。并基于施工现场数据,验证了模型的可靠性,模拟了顶环截面形式、千斤顶布置方式、顶环高度3个参数对顶管断面裂缝的影响。结果表明:在顶进施工条件允许情况下,建议采用均布、对称的千斤顶布置方式;顶环采用闭口截面和适当的高度可减少管体顶进过程中裂缝的产生。 Abstract: In order to analyze the section cracks development of reinforced concrete pipe used for jacking construction, taking the geometric nonlinearity of materials and the damage and degradation of concrete into account, the ABAQUS finite element model was established, and the reliability of the model was verified based on the construction site data. The three influence parameters of jack layout, top ring height and top ring section form on the section cracks were studied. The results show that it is recommended to use symmetric jacks under the premise of permitting construction conditions. The arrangement is more conducive to the force of the pipe body, and the closed cross-section and appropriate height of the top ring are more conducive to control the development of cracks during the pipe body jacking process.
袁焕鑫,蒋强忠,杜新喜,等.钢筋混凝土顶管施工端面裂缝模拟分析[J].混凝土与水泥制品,2022(11):35-38. YUAN H X,JIANG Q Z,DU X X,et al.Simulation Analysis on Section Cracks of Reinforced Concrete Pipe used for Jacking Construction[J].China Concrete and Cement Products,2022(11):35-38.
带钢板UHPC湿接缝梁的抗剪性能试验研究
带钢板UHPC湿接缝梁的抗剪性能试验研究
  • 文庆军1,邓 华1,王 凯2,欧阳康3,晏班夫3
2022年第11期
摘要
引用本文
摘   要:为研究带钢板UHPC湿接缝梁的抗剪性能及其理论计算方法,设计和制作了3个带钢板UHPC菱形湿接缝试验梁,采用四点法进行了抗剪试验研究,并根据法国规范SETRA-AFGC 2016对试验结果进行了验算。结果表明:带钢板UHPC湿接缝梁的抗剪承载力随剪跨比增加而减小,当剪跨比为2.4时,延性最佳;带钢板UHPC湿接缝梁破坏形态均为接缝错位剪切破坏,主裂缝沿接缝靠近跨中一侧发展,接缝中下部发生错位,靠近支点侧出现密集斜裂缝;计算值与试验值之比平均值为0.7,可用于指导设计。 Abstract: In order to study the shear performance and theoretical calculation method of the UHPC wet joint beams with steel plates, 3 pieces of UHPC diamond-shaped wet joint test beams with steel plates were designed and fabricated for shear test research. The four point method was adopted to conduct shear test research, and the test results were verified by using SETRA-AFGC 2016. The test results show that the shear capacity of UHPC wet joint beams with steel plates decreases with the increase of shear span ratio, and the ductility is the best at the shear span ratio of 2.4. The damage form of the joint beam is joint misalignment shear damage, the main crack develops along the side of the wet joint near the middle of the span, the misalignment occurs in the middle and lower part of the joint, and the dense oblique cracks appear near the branch side. The average value of the ratio of calculated and the test values is 0.7, which is suitable for the designing guidance.
文庆军,邓华,王凯,等.带钢板UHPC湿接缝梁的抗剪性能试验研究[J].混凝土与水泥制品,2022(11):39-43. WEN Q J,DENG H,WANG K,et al.Experimental Research on Shear Performance of UHPC Wet Joint Beams with Steel Plates[J].China Concrete and Cement Products,2022(11):39-43.
先张法预应力混凝土H型护岸桩的试验及应用
先张法预应力混凝土H型护岸桩的试验及应用
  • 曾 凯1,2,干 钢1,2,俞晓东3
2022年第11期
摘要
引用本文
摘   要:设计了一种先张法预应力混凝土H型护岸桩,并通过足尺对比试验,研究了先张法预应力混凝土H型护岸桩的抗裂性能、抗弯(剪)承载力、变形能力及破坏特征。试验结果表明,先张法预应力混凝土H型护岸桩的抗弯破坏为受压区混凝土破坏,试验中钢绞线未断裂,桩身出现均布竖向裂缝;抗剪试验为受剪段混凝土斜裂缝开展后的混凝土剪压破坏,各项指标均达到设计要求。工程应用结果表明,设计的先张法预应力混凝土H型护岸桩可满足不同类型护岸工程的要求。 Abstract: A new type of pretensioned spun concrete revetment H-type revement pile was designed, and verified by full-scale comparative tests. And the crack resistance, flexural (shear) bearing capacity, deformation capacity and failure characteristics of the pretensioned spun concrete revetment H-type revement pile were studied. The test results show that the flexural failure is the concrete failure in the compression zone, the tensile steel strand is not broken, and the pile body has vertical cracks distributed evenly. All indicators can reach the design requirements. The engineering application results show that the designed Pretensioned Spun Concrete H-type Revetment Pile can meet the requirements of different types of revetment project.
曾凯,干钢,俞晓东.先张法预应力混凝土H型护岸桩的试验及应用[J].混凝土与水泥制品,2022(11):44-48. ZENG K,GAN G,YU X D.Application and Experiment on Pretensioned Spun Concrete H-type Revetment Piles[J].China Concrete and Cement Products,2022(11):44-48.
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